Climbing stick



FIG. 1 is a perspective view of a climbing stick;

FIG. 2 is a first side view of the climbing stick;

FIG. 3 is a second side view of the climbing stick;

FIG. 4 is a third side view of the climbing stick; and,

FIG. 5 is a fourth side view of the climbing stick.

All broken lines illustrate portions of the climbing stick that form no part of the claimed design. 

CLAIM The ornamental design for a climbing stick, as shown and described. 